Nov 13, 2012 10:00am PST
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Nov 7, 2012 6:30pm PST
when we talk about the energy per charge, we're talking about a concept called voltage. guess where the voltage will be higher, here or here? when i hold it like this, i'll have a voltage difference. when i hold it like this, i'll have-- the same. --no voltage difference. when i hold it like this, you saw a current. when i held it like this, you saw no current. i wonder if there's a reason for that. we're gonna talk about that next time. see you then. physics, yey. [music]